<style>  
.searchSbmFl {background:#F9F9F9;border:1px solid #999;color:#444;font-family:Verdana, Tahoma, helvetica, sans-serif;font-size:11px;vertical-align:middle;margin:2px;padding:2px;}  
.searchSbmFl:hover {background:#CCC;border:1px solid #888;color:#111;font-family:Verdana, Tahoma, helvetica, sans-serif;font-size:11px;vertical-align:middle;margin:2px;padding:2px;}  
</style>  
<div class="searchForm">  
<form onsubmit="this.sfSbm.disabled=true" method="get" style="margin: 0pt;" action="http://Ваш сайт.ру/search/">  
<div class="schQuery" align="center"><input name="q" maxlength="30" size="30" class="queryField" type="text">  
</div>  
<div class="schBtn" align="center">  
<input class="searchSbmFl" name="sfSbm" value="Найти" type="submit"></div>  
</form>  
</div>  
<script type="text/javascript">  
$('div.searchForm input.searchSbmFl').before('<label for="YandexSearch">Yandex-<input style="height:15px; width:15px; vertical-align: middle;" id="YandexSearch" name="Yandex_search" type="checkbox" /></label>');  
$('div.searchForm form').submit(function(){if($('div.searchForm input#YandexSearch').is(':checked')){window.location = 'http://yandex.ru/yandsearch?text=' + location.host + '' + encodeURIComponent($('div.searchForm input.queryField').val()); return false;}});  
</script>
<script type="text/javascript">  
$('div.searchForm input.searchSbmFl').before('<label for="GoogSearch">Google-<input style="height:15px; width:15px; vertical-align: middle;" id="GoogSearch" name="google_search" type="checkbox" /></label>');  
$('div.searchForm form').submit(function(){if($('div.searchForm input#GoogSearch').is(':checked')){window.location = 'http://www.google.com/search?sitesearch=' + location.host + '&q=' + encodeURIComponent($('div.searchForm input.queryField').val()); return false;}});  
</script>